pBR 322: a) pBR 322. b) pUC vectors. +39 (0)49 8763311 Fax +39 (0)49 8750196. Most refrigerants today are hydrochlorofluorocarbons (HCFCs), which deplete the ozone layer. R-12 has a boiling point of -29 degrees Celsius and is generally phased out of use in today's industries. R11 and r12. C. Direct as well as diffuse radiation. Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. The most commonly used amplitude demodulator is the . Answer 1. 8. Skip to content. MCQ Biology - Learning Biology through MCQs. 30. 3.Methyl chloride: used in domestic & industrial refrigerators (now obsolate) 4.Fluorocarbons : Freon -11,12,13,22,113,114, etc. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and … b) 6 . number: IT01334900287 Net Assets Euro 2.356.879,00 Related MCQs: Any method of teaching which involves two or more students, can be termed as_____? It is classified as an HFC refrigerant and has been banned in some countries due to it’s global warming potential. In the past, numerous secondary refrigerants were commonly used, such as brines, which were water-salt (e.g., sodium chloride and calcium chloride) solutions, and even today they are still used in spite of their corrosive effects. MCQ on Plant Biotechnology - Plant Tissue Culture. Our Solstice ® brand of hydrofluoroolefins (HFOs) offer comparable performance to today’s most widely-used stationary and mobile refrigerants. Most Popular Biology MCQs. Registered office: Via Nino Bixio, 6 – 35131, Padova ITALY V.A.T. A) euro B) Japanese yen C) U.S. dollar D) British pound. Figure 1 depicts a typical, single-stage vapor-compression system. a) Mylar b) Silicon carbide c) Ferrous oxide d) Silver chloride. View Test Prep - Topic 7 MCQ with answers from BUSS 2058 at University of South Australia. Any group of words can be chosen as stop words for a given purpose. No matter what you believe about global warming or climate change, the leaders of this country and many other nations around the world will be taking steps to control or reduce the amount of carbon released into the atmosphere. MCQ on Fluorescence spectroscopy: Page-8. The most widely used solar material is (A) arsenic. The most promising alternatives for large industrial air-conditioning systems would seem to be R1234ze and R1234zd. These CFC refrigerants answered that need. Freezants. Answer: c Explanation: Photo ionization detector uses ultraviolet radiation from lamps to produce ionisation of solute molecules. 9. Which of the following is the most widely employed logic family? The majority of refrigerants used today have a harmful impact on the environment and global efforts to find safe and effective alternatives are starting to take shape. Topic 7 MCQ 1. Answer: a. Refrigerants - MCQs with Answers Q1. Computer Architecture MCQ DBMS MCQ Networking MCQ. There has also been, however, a considerable rise in the use of R32 (GWP of 675), present in around 37% of the split units sold in the Old Continent (the most optimistic estimates predict that this will reach 80% by 2030). Infrared range for fiber optics . c) Mannol. MCQ on Fluorescence spectroscopy: Page-8. As a result, researchers, engineers and technicians associated with the refrigeration sector are looking for a suitable environment-friendly … R134a and r152a. b. online retailer. As far as heat pumps are concerned, 80% of those sold in 2019 used R410A (with R134A in second place). I believe that in every phrase there is scope for improvement and that every original version of a text should be perfected, by fine-tuning the words until a truly special result is achieved. Answer: b Explanation: Thermal conductivity detector is known as Katharometer. In an electrostatic precipitator the: a. discharge electrode is negatively charged b. collector electrode is negatively charged c. d... A check valve is a valve that: a. allows flow in one direction only b. allows flow in two directions c. allows flow at regular inter... Solenoid Valves are used in: 1. A recent survey of market trends revealed that purchases of air conditioning systems and heat pumps grew last year; however, with the general increase in global temperatures (linked to ongoing climate change), further growth in demand is expected in the near future. C Programs. Which of the following chemicals are most widely used for protoplast fusion? A. Four cycle engine lubrication is usually: Potential Environmental Impact of Liquids, Potential Environmental Impact of Operating Facilities. Given the variable degree of environmental impact, it is important to monitor their use. It is the most popular logic family. by . Page-3 section-1 [Gray] [ASCII] [EBCDIC] 7 people answered this MCQ question ASCII is the answer among Gray,ASCII,EBCDIC for the mcq Which of the following is the most widely used alphanumeric code for computer input and output C - Stacks and Queues. Which refrigerants have zero odp. Examples of hydrofluorocarbon refrigerants hfc's . Which of the following is the most widely used external memory data structure? The data shows that air-conditioning systems sold in Europe still mostly use the refrigerant R410A (currently one of the refrigerants with the highest GWP). A pinoybix mcq, quiz and reviewers. a. Refrigerants are used primarily in refrigerators/freezers, air-conditioning, and fire suppression systems. Hydrofluorocarbons hfc. (A) P and S (B) Q and R (C) P only (D) S only . Which of the following is a line source in fluorometry (A) Mercury vapor lamp (B) Xenon discharge lamp (C) Deuterium lamp (D) Lasers. The most widely used refrigerant metering device, which consists of a pressure-sensitive bellows or diaphragm connected to a temperature sensing bulb, is a/an: The cross-section of a Bourdon tube is generally. Direct radiation only. A. It is clear, as also emerged in the various market exposures last year, that it is pushing towards low GWP or natural solutions such as Co2 , ammonia, R290 and others. In the most widely used beam splitter, a thin film of _____ is sandwiched between two plates of low refractive index solid. 18. Hydrofluorocarbons. MCQ on IR spectroscopy: Page-2. The basic function of TTL gate is which of the following functions? Given below is the stretching vibration of a diatomic molecule. Electric Traction . Chances are, if you have an AC system over ten years old, you are most likely using this refrigerant! a. The wireless LAN specification is … The other two countries analysed in the survey were the United States and China. Covid and global air conditioning market performance, Germany: a jewel in the crown of Mechanically controlled ventilation investment. 7 people answered this MCQ question is the answer among for the mcq The most important and widely used tube well in India, is It is the most popular logic family. Narrow gauge is used in hilly terrain. Broad gauge is the most widely used rail gauge in India. A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle.In most cycles it undergoes phase transitions from a liquid to a gas and back again. 700 – 1200 nm . It is thanks to these views that I have learnt the Difference between being Ordinary and Extraordinary: an abyss, which anyone wishing to satisfy their readers cannot afford to overlook. (C) solar radiation into thermal energy. Hence, we have only two trigrams from the given sentence – ‘Google search engine’ and ‘search engine India’. I am a Project Manager, Journalist, and a Blogger who is Passionate about writing. a. Diode bridge circuit . The main obstacle to the switch to refrigerants with a lower GWP (like R32) is their moderate flammability risk, which means that their use is not recommended in large quantities inside industrial systems. This test comprises of 50 questions on Thermodynamics. Questions and answers - MCQ with explanation on Computer Science subjects like System Architecture, Introduction to Management, Math For Computer Science, DBMS, C Programming, System Analysis and Design, Data Structure and Algorithm Analysis, OOP and Java, Client Server Application Development, Data Communication and Computer Networks, OS, MIS, Software Engineering, AI, Web Technology and … b. Balanced modulator . Low pressure, medium pressure, and high pressure c.... A clamp-on ammeter measures current flow by using: a. Shunting current through a milli-ammeter b. Other natural refrigerants are water (H 2 O, R-718) and air (R-729), used only for special applications, or sulphur dioxide (SO 2) and methyl chloride (CH 3 Cl), which are no longer used. Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. a) 7 . a) AND b) OR c) NOR d) NAND. Most widely used solar material is..... A. Arsenic. c) pSC101. (D) solar radiation into kinetic energy. R32 and R290 (propane) are still not widely used, but also in that case, a gradual reduction in the use of R410 is expected by 2023. c. 300 – 2000 nm . Explanation: DC series motors are used in traction applications due to their excellent starting torque properties. In fact, most refrigerators in the Indian market are now on R-600A and there are no reported incidents of any accidents due to the same. 20. MCQ in Modulation Part 18 as one of the Communications Engineering topic. These refrigerants were considered at the time to be less harmful than the commonly-used refrigerants of the time, including methyl formate, ammonia, methyl chloride, and sulfur dioxide. What is Callus? a) Manitol. The alarming climate issue is one of the main reasons why such great attention is being devoted to the emissions caused by refrigerants. a) Complement fixation test b) Immunofluorescence technique c) Schick skin test d) Agglutination test 9) What is the drug regimen used in the treatment of chronic Q fever? 30% c. 55% d. 60% e. 70% Answer: E. Rotary pumps: a. Home MCQ Refrigeration Refrigeration and Air-Conditioning Multiple Choice Questions with Answers - Set 03 ... , generally used in winter air-conditioning to warm and humidity the air, is called (A) Humidification (B) Dehumidification (C) Heating and humidification (D) Cooling and dehumidification. Home / All Categories / Networking / LAN Standards / 1. The fluorescence is mainly results from which of the following transitions? Common Refrigerants Used in Buildings HCFC-22 (R-22) HCFC-22 (R-22) has been the most popular refrigerant for residential heat pump and air-conditioning systems for over four decades. HFCs (Hydrofluorocarbons) are one of the most widely used refrigerants worldwide. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. AHR2021 – First moved, then cancelled – and the ASHRAE Meeting will also be online. Photovoltaic cells or solar cells convert (A) thermal energy into electricity. 19. The fluorescence is mainly results from which of the following transitions? R-22, also known as HCFC-22 or Chlorodifluoromethane is the most widely used HCFC refrigerant. D. All of the above View Answer. Flame ionisation detector is also known as Katharometer. 7. (a) Mannitol (b) Polyethylene glycol (c) Sorbitol (d) Mannol. 103. ... NEET BIOLOGY MCQ 2020. 2.Carbon dioxide : used in marine refrigerators, dry ice making etc. In this regard, European Community legislation is one of the most advanced in the world, thanks to its regulations promoting the use of refrigerants with a low global warming potential (GWP). Explanation: Generally, mylar is the thin film used in beam splitters. Which from the following is termed as student-centered learning method? Correct Answer. The most common refrigerants are: R-11, R-12, R-22, R-134a, and R-502. B. B-tree. 32. The IR region most widely used for qualitative analysis is (A) Near IR (B) mid IR (C) Far IR (D) All of the above. Authoritative executions are the most widely used in the: A) business-to-business sector. 2. A widely used balanced modulator is called the . Last year, European sales of air-conditioning units reached 11.9 million. d) Poly ethylene glycol (PEG) 7. The most widely used refrigerant control, which consists of a bellows or a diaphragm chamber connected to a temperature sensing bulb by means of a small capillary tube is a/an a) hand operated expansion valve b) thermostatic expansion valve c) automatic expansion valve d) high pressure float valve e) low pressure float valve Answer: B UNILAB S.R.L. Refrigerants that contain hydrogen fluorine and carbon. Answer: d. Explanation: The basic function of TTL gate is NAND function. CFC compounds are generally of the safest primary refrigerants available. ... 898. Dichlorodifluoromethane, or R-12 in the industry, is nontoxic, nonflammable, colorless and, when used in low concentrations, odorless. b) Sorbitol. It is the most popular logic family. MCQ 16.39 Semi-averages method is used for measurement of trend when: (a) Trend is linear (b) Observed data contains yearly values (c) The given time series contains odd number of values (d) None of them MCQ 16.40 Moving-averages: (a) Give the trend in … Tube wells B. Perennial Canals C. Karez D. Dams. MCQ No 4.12 The measure of dispersion which uses only two observations is called: (a) Range (b) Quartile deviation (c) Mean deviation (d) Standard deviation MCQ No 4.13 In quality control of manufactured items, the most common measure of dispersion is: by . a) True b) False. b. Compound used in refrigerators, air conditioners, and heat pumps to transfer heat from one place to another, thus cooling or heating a space. B) consumer sector. 8. Which is the most widely used irrigation method in Pakistan? But they are the greenest refrigerants in the market. Frigidaire was issued the first patent for the formula for the CFC's on December 31, ... used in large centrifugal chillers and low pressure systems. Refrigerants are cooling mediums that absorb heat at low temperature and pressure and release heat at high temperature and pressure. Answer: (c) Stop words are words which are filtered out before or after processing of natural language data. Which is the most widely used irrigation method in Pakistan? When it is used as a refrigerating machine with all other ... 07 1. d. 400 – 7000 nm 8) What is the most widely used serological test for the diagnosis of the Rickettsia rickettsiae from skin biopsy? Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. R12: CCl2F2 dichlorofluoromethane, used for refrigeration systems at … A change is starting to happen however, with a gradual move towards the use of R134A and refrigerant mixes with a low GWP. Solstice products have a short atmospheric lifetime, which means they have very low global warming potential. Freon R22 is one of the most widely used R22 refrigerant brands in China. Other common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Ammonia (R-717) accounted for 60% of the market share for natural refrigerants in 2014. The most popular and widely used engineered plasmid vector is. The main characteristics of the most commonly used natural refrigerants are summarised in the following table: ... 895. first most widely used refrigerant. Liquid refrigerants that are used to quickly freeze food products. (a) Cork cells (b) Meristem (c) Sieve tube (d) Xylem vessels. C. Red-black tree . The most widely used refrigerant in the United States at the moment remains R410A, due to the lack of efficient alternative solutions. C - Matrices. Many working fluids have been used for such purposes. The most widely advertised use of the Internet is the _ a. portal. Power Engineering | Multiple Choice | Questions and Answers | Test bank | Chapter, The cross-section of a Bourdon tube is generally a) circular b) round c) cylindrical d) spherical e) oval Answer: E. Air conditioning ducts are classified as: a. Manufacturers, who use these refrigerants, claim that they have taken good care in using these refrigerants and the appliances are absolutely safe. (D) steel. (B) electromagnetic radiation directly into electricity. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … In pBR 322, pBR stands for. According to Mike Opitz, Certification Manager, LEED™ for Existing Buildings (USGBC), Chemical refrigerants are the heart of a large majority of building HVAC and refrigeration equipment. Large and long overalls. Which of the following plant cells shows totipotency? 4. HVAC: which products were found to be “immune” to Covid? Examples of chlorofluorocarbons refrigerants cfc's. The reduced mass of the two atoms involved in this stretching vibration will be Most widely used solar material is..... A. Arsenic B. Cadmium C. Silicon D. Steel Electric Traction; Air compressor; Centrifugal Pump; Machine shop; Show Explanation. Fuel gas systems as the latching valve 3... Fluidized bed boilers can successfully burn coal with ash contents as high as a. The most widely used detector in spectrofluorometer is (A) Barrier layer (B) Golay detector (C) Bolometer (D) PMT . a. Diode mixer . The current produced is measured and recorded. 2. C - Arrays and Pointers. Automatic expansion valve c. Capillary tube d. Equalizer e. Constant pressure valve Answer: A d. 400 – 7000 nm Vapor-compression uses a circulating liquid refrigerant as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere. The _____ is the currency most widely used as a reserve asset. The right choice of refrigerant depends on the situation at hand. Ammonia to continue being the most widely used natural refrigerant Published on May 15, 2019 Ammonia (R-717) accounted for 60% of the market share for natural refrigerants in 2014. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. The IR region most widely used for qualitative analysis is (A) Near IR (B) mid IR (C) Far IR (D) All of the above. Although there is currently no clear legislation which imposes the substitution of HFC’s in the USA, some individual states are pioneering the first tentative steps in this direction. Three most common expendable refrigerants. 700 – 1200 nm . Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Ques 12. So B-tree is used as an external memory data structure. 2. Shift schedules. 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To monitor their use Arsenic B. Cadmium C. Silicon d. Steel the MCQ hub such purposes an HFC refrigerant has... Steel the MCQ hub Manager, Journalist, and a Blogger who Passionate! Widely employed logic family if you have an AC system over ten years old, you most! In Traction applications due to their excellent starting torque ) Arsenic, R-134a, and R-502 been! Back to the square of the following is termed as student-centered learning method are concerned, %. Machine with all other... 07 1 method in Pakistan refrigerants and the appliances are safe. To produce ionisation of solute molecules chloride: used in marine refrigerators, dry ice making etc you. The given sentence – ‘ google search engine in India in refrigerators/freezers, air-conditioning, and non-halogenated such. Exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other exams. Known as Katharometer from 4000 km to 20,000 km since independence Celsius and is generally phased out use! 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